我試圖讓喜歡這裏滾動動畫(注意同心圓圖形衰落,當你向下滾動): http://demo.atticthemes.com/skoty/的Javascript動畫上滾動位置
這是我SOFAR,但它一直莫名其妙地掛: http://jsfiddle.net/v4zjgwL6/
var timer;
var triggerHeight = $("#bar").offset().top;
var headerAvatar = $(".header-avatar-wrapper");
$(window).scroll(function() {
if(timer) {
window.clearTimeout(timer);
}
timer = window.setTimeout(function() {
var y = $(window).scrollTop();
if(y > triggerHeight - 220) {
headerAvatar.css("visibility", "visible");
headerAvatar.animate({opacity: 1}, 200);
} else {
headerAvatar.animate({opacity: 0}, 200);
headerAvatar.css("visibility", "hidden");
}
}, 10);
});